clearing melted regexp search options

[synhedionn]

In Emacs, we have tab Options>Customize Emacs> 1.Settings matching regexp
                                                                       
2.Options
                                                                       
3.Faces
                                                                       
4.Groups

a)What is the difference between them?
I suppose 3 is for faces colors, but aren't Faces one subcategorie of
options?
b)Concretely, which one of these search option must I use to see all
"options" relative to colors tweaking(perhaps searching #[0-9]{6}, but which
of 1-4 search item to use)?
c)can you give concrete calls exemples, moreover for 1 and 2?
                                            
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